Manufacture of tarred paper



side only.

STATES ATENT OFFICE,

MANUFACTURE OF TARRED PAPER.

SPECIFICATION orming part of Letters Patent No. 312,451, dated February 17, 1885.

Application filed April 14, 1884.

(No model.)

` of Philadelphia, Pennsylvania, have invented eertain Improvements in the Manufacture ot' Tarred Paper, of which the following` is a speeifieation.

Myinvention consists of a niode, described and claimed 'hereinafter, of producing conpound webs of paper coated with tar on one In the acconpanying drawings, Figure 1 is 'a sectional diagram illustrating the mode of ent paper, which may be of the character known as,roofingpaper, and which'nay be derived from as many different rolls, the outer webs, a a', being paper previously tarred.

The three webs are drawn by pressure-rolls G G' through a coating material of tar, pitch,

d or asphalt naintained in a heated Condition converging to the rolls, so that each web shall be exposed to the coating material. The rolls G G', which revolve in the direction of the arrow, compress the three coated webs,whieh, thns eoncentrated together, become one threeply compound web, and thns may be directed to and wound round a roller prior to being subjected to the second branch of the process, which consists in tearing the said conpound web apart, and thereby Converting it into two webs each coatecl with tar on one side only. The separation does not take place where the face of one web was cemented to that of another, but in the middle of the central web, a, the fibers of which are so pulled apart that one half of the said web will adhere to the outer web, a', and the other half to the other outer web, these two outer webs having been coated with tar prior to being cemented to the middle web, and hence the tendency of the latter to adhere so tenaeiously to the outer webs as to permit the separation by the disitegration of the fibers of the. said central web. XVhen the compound web has been thus torn apart, there will be two webs, one face of which is tarred, the opposite face being untarred and presenting a clear paper surface. The paper thus produced may be used for a Variety of pnrposes for carpet-linings, for instance, or

as a water-proof lining for boxes and chests, or for water-proof wrappings. When extra stout paper oi' this kind is required, four webs of tarred paper may be first Combined with a central web of the untarred paper and the compound web separated in the middle of this central web. v V

In using' the term tai-, I wish it to be understood that it includes piteh, asphaltum, bitumen, or any compound thereof.

As regards the prior state of the art, I may refer to the Patent N o. 226,459, April 13, 1880, in which two webs placed face to face are passed through a coating material which adheres to the exposed surfaces only, so that when the webs are taken apart each will be coated on one side only. I therefore do not elaim, broadly, so passing webs or sheets of paper through coating material that one face only of each web shall be coated; but"` I Claim asny invention- The mode herein describcd of producing paper tarred on one side only, the said mode consisting in passing two tarred webs and one intermediate untarred web through the coating material, pressing and cenenting the three webs together, and finally dividingthe compound three-ply web by 'pulling it apart, the line of separation being in the middle of the said interncdiate web, all substantially as set forth.

In testimony whereof I have signed my name to this specifieation in the presence of two subscribing witnesses.

' MICHAEL EHRET, J R.

Witnesses:

JOHN M. CLu'roN, HARRY SMITH. 

